[mythtv-users] Surround Sound AS3/DTS out SPDIF

Josh TwoOneSix at thatclothingco.com
Mon Feb 5 03:06:58 UTC 2007

Steven Adeff wrote:
> On 2/4/07, Josh <TwoOneSix at thatclothingco.com> wrote:
>> As anyone that's been reading the list recently knows, I have a
>> Revolution 7.1 that I can get everything to work with except for AC3 or
>> DTS pass through... it just doesn't work for me on Fedora Core 6 (or
>> Fedora Core 5). I have all but given up on this card and want to buy one
>> that I know will work.
>> Can people that have AC3 and/or DTS pass through working over S/PDIF
>> (Coax or Optical) please let me know what distro and sound card your using?
> A quick look up at the ALSA supported cards page shows that the card
> is fully supported. It also looks like its powered by an envy24HT,
> which I know is fully supported.
> so you may want to make sure your running the latest ALSA and check
> the link below, a couple people state they have the digital out
> working, so it may be of help...
> http://www.alsa-project.org/alsa-doc/doc-php/template.php?company=Midiman%2FMAudio&card=Revolution+7.1.&chip=ICE1724+%28Envy24HT%29&module=ice1724
Yea, I haven't had a problem getting the SPDIF (digital) out or ALSA 
working. I can get everything to output through the digital coax and I 
can get AC3 to pass through with 2 channels of audio, but when I send a 
5.1 stream (from an ISO ripped DVD, MythDVD, or anything directly 
through mplayer) I either get static or no sound at all. The ALSA 
User-List hasn't been of much assistance either as everyone keeps 
sending me the same URL as above and it hasn't fixed the problem no 
matter how many times I read it. Getting AC3 pass through working with 
Myth shouldn't be this difficult. I have a Turtle Beach Riviera card 
sitting here too that a lot of people say should work great but I can't 
seem to find a soul on these lists with either card and FC6 that have it 
pushing 5.1 successfully through the digital output. I just don't 
understand... I mean, if I'm successfully sending all signals out to 
ALSA:spdif (and ALSA:default for music) on the card, why in the world am 
I essentially going mute the moment I turn on AC3 pass through in Myth? 
I have hooked a normal DVD player up to the receiver and it flips into 
DOLBY DIGITAL and 5.1 works great so I'm almost certain that it's the 
output from the front end Myth system and not the receiver itself. I'm 
just over this issue and have spent way to much time trying to resolve 
it... I just want a piece of hardware that is known working in my type 
of setup. You had better believe that if I ever get this Revolution 7.1 
or the Riviera working I'll be doing a write-up on it for the Wiki.

Thank you for trying to help... I really do appreciate it, I'm just 
extremely frustrated right now.


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